Add project boilerplate, and README

.github/CODEOWNERS

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+# Each line is a file pattern followed by one or more owners.
+# These owners will be the default owners for everything in
+# the repo. Unless a later match takes precedence,
+# The users listed below are global owners and will be
+# requested for review when someone opens a pull request.
+* @marijaselakovic @hammerhead

.github/dependabot.yml

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+version: 2
+
+updates:
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.gitignore

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+.venv*
+*.egg-info
+.eggs
+__pycache__

README.md

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+# crate-airflow-tutorial
+Orchestration Project - Astronomer/Airflow tutorials
+
+
+## About
+
+This repository contains a few examples of Apache Airflow DAGs for automating recurrent
+queries. All DAGs run on Astronomer infrastructure installed on Ubuntu 20.04.3 LTS.
+
+In the [dags](dags) directory you can find a subset of our DAG examples.
+Each DAG is accompanied by a tutorial:
+
+* [data_retention_delete_dag.py](dags/data_retention_delete_dag.py) ([tutorial](https://community.crate.io/t/cratedb-and-apache-airflow-implementation-of-data-retention-policy/913)): implements a retention policy algorithm that drops expired partitions
+* [data_retention_reallocate_dag.py](dags/data_retention_reallocate_dag.py) ([tutorial](https://community.crate.io/t/cratedb-and-apache-airflow-building-a-hot-cold-storage-data-retention-policy/934)): implements a retention policy algorithm that reallocates expired partitions from hot nodes to cold nodes
+* [data_retention_snapshot_dag.py](dags/data_retention_snapshot_dag.py): implements a retention policy algorithm that snapshots expired partitions to a repository
+
+
+## Testing
+
+```shell
+pip install --editable=.[develop,test]
+poe check
+```